janko hauser jhauser at ifm.uni-kiel.de
Tue Dec 11 09:03:07 EST 2001

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one can not define empty list/tuples with a predefined length.
it is possible to create a sequence of a given length by multiplying a 
one element sequence.

>>> a=(1,)*3
>>> a
(1, 1, 1)

This is slighly more economic than appending or inserting to an empty
list.

>>> a=[]
>>> a.append(1)
>>> a
[1]

HTH,
__Janko

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